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Is there anyone who can help me?

I found this code but he does not want to work

<?php
function hide_links($post_content) {
 if ( in_category( array( 'YOUR CAT ID', 'YOUR CAT ID') )) {
	global $wpdb;

		return ($post_content = !is_user_logged_in()?preg_replace('/<a(.*?)>(.*?)<\/a>/m', '<div style="color:red;font-size:12px;"> YOUR TEXT</div>',$post_content):$post_content);
	 }	

 }
  add_filter('the_content', 'hide_links')

?>